From: Vincent Marciante <marciant@li.net>
Subject: Simpler Question (was Assigning to dereferenced null access variable)
Date: 2000/11/07
Date: 2000-11-07T00:00:00+00:00 [thread overview]
Message-ID: <3A0847ED.49AF@li.net> (raw)
In-Reply-To: 3A05A609.4CE6@li.net
--Okay, I cut down the question to:
--
--Why don't both blocks in the following code behave similarly?
--I get the following output using OS/2 GNAT 3.12p
--
--The Null_Characters(1..0) assignment succeeded
--The Null_Characters assignment caused Constraint_Error
--
--If the above indicates a compiler defect then what is the
--correct behavior?
with Ada.Text_IO; use Ada.Text_IO;
procedure Test_Null_Assignments is
type Characters is array (Positive range <>) of Character;
Null_Characters : Characters(1..0);
type Reference is access Characters;
type Character_Sequence is
record
The_Characters : Reference;
end record;
Null_Sequence : Character_Sequence;
begin
begin
Null_Sequence.The_Characters(1..0) := Null_Characters(1..0);
Put_Line("The Null_Characters(1..0) assignment succeeded");
--OS/2 GNAT 3.12 succeeds
exception
when Constraint_Error =>
Put_Line("The Null_Characters(1..0) assignment caused
Constraint_Error");
end;
begin
Null_Sequence.The_Characters(1..0) := Null_Characters;
Put_Line("The Null_Characters assignment succeeded");
exception
when Constraint_Error =>
Put_Line("The Null_Characters assignment caused
Constraint_Error");
--OS/2 GNAT 3.12 raises Constraint_Error
end;
end;
next prev parent reply other threads:[~2000-11-07 0:00 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2000-11-05 0:00 Assigning to dereferenced null access variable Vincent Marciante
2000-11-07 0:00 ` Vincent Marciante [this message]
2000-11-07 0:00 ` Simpler Question (was Assigning to dereferenced null access variable) Jean-Pierre Rosen
2000-11-07 0:00 ` Vincent Marciante
2000-11-08 4:20 ` Robert Dewar
2000-11-08 0:00 ` Vincent Marciante
2000-11-09 4:43 ` Robert Dewar
2000-11-08 0:00 ` GNAT for OS/2 (was Re: Simpler Question (was Assigning ...)) Vincent Marciante
2000-11-10 1:52 ` tjerick
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